ARX_ERROR: eNotThatKindOfClass

[zcohen]

How to fix this message? This message is always appearing on my screen and causing my AutoCad to crash.

Please Help!

[RhettButlur]

Autodesk 2006 OE Hotfix mentions the ARX...fix.

thanks again for your help

[Sarah_10]

I am having a similar issue. I recently installed AutoCAD 2006, but worked on a drawing in 2011, saved to 2004 to email home.

I get the ARX_ERROR: eNotThatKindOfClass and if I copy and paste a block I get a duplicate Key error message and I can't close the message.

ARX_ERROR: eNotThatKindOfClass always appears in every command line for any comand even when i measure, move an object, etc. Many vendors have worked on this drawing, but I have installed the:

Autodesk AEC object hotfix,

done an audit

purged.

I don't know what to do next? very frustrating.

Any other solutions....thoughts?

Thanks,

Sarah

[Glenn4965]

I am using AutoCad2006, others in the office are using later versions as well as 2007LT and 2013LT.  I was gettiing this error and the "distance" command would not work, others also.  

Went into Tools/Options/Open and Save, changed Demand load ObjectARX apps: from "Object Detect and Command Invoke" to "Disable Load on Demand".  This took care of the problem on the drawings I was having trouble with.  It seemed to have created another problem with a few other drawings but I could not duplicate the problem later.  

Hope this may help.